The correct answer is: C. What do you think will happen?
The future is uncertain, so it is impossible to say for sure what will happen. However, we can make educated guesses based on the information we have available. For example, we can look at past trends and see how they have changed over time. We can also look at current events and see how they might affect the future. By doing this, we can get a better idea of what might happen in the future.
Option A is incorrect because it is asking about what is happening now, not what will happen in the future. Option B is incorrect because it is asking about what has happened in the past, not what will happen in the future. Option D is incorrect because it is asking about what has happened in the past, not what will happen in the future.